placenew: Placement new for rust | Rust Programming Language Community | Page 1

true wave Mar 8, 2026, 2:04 AM

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This is a crate that provides placement-new like functionality for rust, it provides the macro place_boxed!() which allows you to construct structures and non-structures in-place into a box
https://crates.io/crates/placenew/2.0.0
https://docs.rs/placenew/latest/placenew/
https://github.com/Austin-Bennett/placenew

Open to and looking for suggestions/feedback

spark shuttle Mar 8, 2026, 6:45 AM

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Fwiw there's also pinned-init

silk tangleBOT Mar 8, 2026, 6:46 AM

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pinned-init

Library to facilitate safe pinned initialization

Version

0.0.10

Downloads

70 059

true wave Mar 8, 2026, 2:17 PM

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spark shuttle Fwiw there's also pinned-init

As far as i can tell, pin-init and my crate solve different problems, pin-init solves the problem of self-referential initialization, and my crate solve the copy elison problem

spark shuttle Mar 8, 2026, 2:22 PM

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They're related though, self-referential initialisation requires inplace initialisation

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To me it looks like placenew::place_boxed!(...) is mostly equivalent to Box::init(pin_init::init_pin!(...))

#placenew: Placement new for rust